Multiple choice

A man decided to cover a distance of 6 km in 84 minutes. He decided to cover two thirds of the distance at 4 km / hr. and the remaining at some different speed. Find the speed after the two third distance has been covered?

  1. 5kmph

  2. 7kmph

  3. 9kmph

  4. 3kmph

  5. 4kmph
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A Correct answer
Explanation

Total distance 6 km, time 84 min (1.4 hours). Two-thirds distance = 4 km. Time taken at 4 km/h = 4/4 = 1 hour. Remaining distance = 2 km. Remaining time = 1.4 - 1 = 0.4 hours. Speed = 2 / 0.4 = 5 km/h.

AI explanation

Two thirds of the 6 km distance is 4 km, which he covers at 4 kmph in 1 hour or 60 minutes. He has 84 minus 60, equaling 24 minutes or 2 by 5 hours left to cover the remaining 2 km. Using the formula Speed equals Distance divided by Time, the required speed is 2 km divided by 2 by 5 hours, resulting in 5 kmph. The required speed is 5 kmph.

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